Abstract

The Cygnet Coal Measures is a unit of carbonaceous shale, coal and feldspathic sandstone in Tasmania of Upper Permian age. It is overlaingradationally or disconformably by the SpringsSandstone, the lower member of which, BarnettsSandstone, is a thinly-bedded, fine-grained feldspathicto arkosic sandstone, and the upper, theMountain Lodge Sandstone and a more thickly-bedded,medium-grained protoquartzite. The upper partof the Springs Sandstone is probably Otoceratan.The Permo-Triassic boundary lies within thesegradational non-marine units and cannot yet befixed accurately. The base of the Mountain LodgeMember is probably the most convenient boundaryto use as the Permo-Triassic boundary in local fieldmapping.